将变换应用于NSBitmapImageRep [英] Applying transformations to NSBitmapImageRep

问题描述

所以...我有一个图像加载到NSBitmapImageRep对象，所以我能够通过二维数组检查特定像素的内容。现在我想对图像应用几个转换，为一些额外的处理做准备。如果我手动操作图片，在Photoshop中，我会：

So ... I have an image loaded into an NSBitmapImageRep object, so I am able to examine the contents of specific pixels via a two dimensional array. Now I want to apply a couple of "transformations" to the image, in preparation for some additional processing. If I was manipulating the image manually, in Photoshop, I would:

1. 旋转图片


2. 修剪其中的一部分并舍弃其余部分


3. 应用阈值转换（基本上根据我提供的阈值将图像转换为黑白）


4. 重新对图片进行重新取样，以缩小图片（虽然会损失一些图片品质，但会加快后续处理速度）

1. Rotate the image
2. Crop a portion of it and discard the rest
3. Apply a "threshold" transformation (which essentially converts the image to black and white, based on the threshold value I provide)
4. Resample the image to shrink it down a bit (which, although losing some image quality, will speed up the subsequent processing)

（不一定按照这个顺序）

(not necessarily in that order)

有没有客观的C方法来方便这些特定的图像处理，使用NSBitmapImageRep对象中的数据？如果是这样，有人可以指点一些好的例子吗？

Are there objective C methods available to facilitate these specific image manipulations, with the data in the NSBitmapImageRep object? If so, can someone point me to some good examples?

推荐答案

为 /NSBitmapImageRep_Class/Reference/Reference.html#//apple_ref/occ/instm/NSBitmapImageRep/CGImagerel =nofollow noreferrer>位图图像的CGImage代码。然后您可以：

Create a CIImage for the CGImage of the bitmap image rep. Then you can:

1. 旋转


2. 裁剪


3. Apply a 阈值过滤器


4. 缩放

1. Rotate it
2. Crop it
3. Apply a threshold filter
4. Scale it

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